This is the 402nd most frequent Swedish word.
gammal
Old.
In this sentence, 'gammal' is used as an adjective to describe the noun 'bok' (book), specifying its age or state as old.
Jag har en gammal bok.
I have an old book.
Here, 'gammal' is used as an adjective to describe the noun 'katt' (cat), indicating its age.
Hon sa att hennes katt är gammal.
She said that her cat is old.
In this example, 'gammal' is again used as an adjective, this time to describe a person ('mormor', grandmother) concerning her advanced age.